ScreenDimmer

ScreenDimmer allows you to save battery life by automatically dimming your device’s screen after a pre-defined time; or if you wish by turning the backlight off.
Most users suffer unnecessary battery drain while having their iPhone not on standby. Setting auto-lock to a short time makes it better, but is an inconvenience most of the time due to permanent locking and unlocking while waiting for something.
ScreenDimmer is the solution for this problem: Save battery life by reducing the backlight to a minimum if the device hasn’t been used for a pre-defined time and reduce the waste of the most energy consuming component, the backlight, of the iPhone or iPod.
Free yourself from worrying about locking your device